Electro Magnetic Induction And Alternating Currents Question 205

Question: A resistor ‘R’ and 2μF capacitor in series is connected through a switch to 200 V direct supply. Across the capacitor is a neon bulb that lights up at 120 V. Calculate the value of R to make the bulb light up 5 s after the switch has been closed, (log102.5=0.4)

Options:

A) 1.7×105Ω

B) 2.7×106Ω

C) 3.3×107Ω

D) 1.3×104Ω

Show Answer

Answer:

Correct Answer: B

Solution:

  • We have, V=V0(1et/RC)
    120=200(1et/RC)t=RC

    in (2.5)R

    =2.71×106Ω



NCERT Chapter Video Solution

Dual Pane